src/widgets/sp-color-preview.cpp

   1 #define __SP_COLOR_PREVIEW_C__
   2
   3 /*
   4  * A simple color preview widget
   5  *
   6  * Author:
   7  *   Lauris Kaplinski <lauris@kaplinski.com>
   8  *
   9  * Copyright (C) 2001-2002 Lauris Kaplinski
  10  * Copyright (C) 2001 Ximian, Inc.
  11  *
  12  * Released under GNU GPL, read the file 'COPYING' for more information
  13  */
  14
  15 #include "../display/nr-plain-stuff-gdk.h"
  16 #include "sp-color-preview.h"
  17
  18 #define SPCP_DEFAULT_WIDTH 32
  19 #define SPCP_DEFAULT_HEIGHT 11
  20
  21 static void sp_color_preview_class_init (SPColorPreviewClass *klass);
  22 static void sp_color_preview_init (SPColorPreview *image);
  23 static void sp_color_preview_destroy (GtkObject *object);
  24
  25 static void sp_color_preview_size_request (GtkWidget *widget, GtkRequisition *requisition);
  26 static void sp_color_preview_size_allocate (GtkWidget *widget, GtkAllocation *allocation);
  27 static gint sp_color_preview_expose (GtkWidget *widget, GdkEventExpose *event);
  28
  29 static void sp_color_preview_paint (SPColorPreview *cp, GdkRectangle *area);
  30
  31 static GtkWidgetClass *parent_class;
  32
  33 GtkType
  34 sp_color_preview_get_type (void)
  35 {
  36         static GtkType type = 0;
  37         if (!type) {
  38                 GtkTypeInfo info = {
  39                         "SPColorPreview",
  40                         sizeof (SPColorPreview),
  41                         sizeof (SPColorPreviewClass),
  42                         (GtkClassInitFunc) sp_color_preview_class_init,
  43                         (GtkObjectInitFunc) sp_color_preview_init,
  44                         NULL, NULL, NULL
  45                 };
  46                 type = gtk_type_unique (GTK_TYPE_WIDGET, &info);
  47         }
  48         return type;
  49 }
  50
  51 static void
  52 sp_color_preview_class_init (SPColorPreviewClass *klass)
  53 {
  54         GtkObjectClass *object_class;
  55         GtkWidgetClass *widget_class;
  56
  57         object_class = (GtkObjectClass *) klass;
  58         widget_class = (GtkWidgetClass *) klass;
  59
  60         parent_class = (GtkWidgetClass*)gtk_type_class (GTK_TYPE_WIDGET);
  61
  62         object_class->destroy = sp_color_preview_destroy;
  63
  64         widget_class->size_request = sp_color_preview_size_request;
  65         widget_class->size_allocate = sp_color_preview_size_allocate;
  66         widget_class->expose_event = sp_color_preview_expose;
  67 }
  68
  69 static void
  70 sp_color_preview_init (SPColorPreview *image)
  71 {
  72         GTK_WIDGET_SET_FLAGS (image, GTK_NO_WINDOW);
  73
  74         image->rgba = 0xffffffff;
  75 }
  76
  77 static void
  78 sp_color_preview_destroy (GtkObject *object)
  79 {
  80         SPColorPreview *image;
  81
  82         image = SP_COLOR_PREVIEW (object);
  83
  84         if (((GtkObjectClass *) (parent_class))->destroy)
  85                 (* ((GtkObjectClass *) (parent_class))->destroy) (object);
  86 }
  87
  88 static void
  89 sp_color_preview_size_request (GtkWidget *widget, GtkRequisition *requisition)
  90 {
  91         SPColorPreview *slider;
  92
  93         slider = SP_COLOR_PREVIEW (widget);
  94
  95         requisition->width = SPCP_DEFAULT_WIDTH;
  96         requisition->height = SPCP_DEFAULT_HEIGHT;
  97 }
  98
  99 static void
 100 sp_color_preview_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
 101 {
 102         SPColorPreview *image;
 103
 104         image = SP_COLOR_PREVIEW (widget);
 105
 106         widget->allocation = *allocation;
 107
 108         if (GTK_WIDGET_DRAWABLE (image)) {
 109                 gtk_widget_queue_draw (GTK_WIDGET (image));
 110         }
 111 }
 112
 113 static gint
 114 sp_color_preview_expose (GtkWidget *widget, GdkEventExpose *event)
 115 {
 116         SPColorPreview *cp;
 117
 118         cp = SP_COLOR_PREVIEW (widget);
 119
 120         if (GTK_WIDGET_DRAWABLE (widget)) {
 121                 sp_color_preview_paint (cp, &event->area);
 122         }
 123
 124         return TRUE;
 125 }
 126
 127 GtkWidget *
 128 sp_color_preview_new (guint32 rgba)
 129 {
 130         SPColorPreview *image;
 131
 132         image = (SPColorPreview*)gtk_type_new (SP_TYPE_COLOR_PREVIEW);
 133
 134         sp_color_preview_set_rgba32 (image, rgba);
 135
 136         return (GtkWidget *) image;
 137 }
 138
 139 void
 140 sp_color_preview_set_rgba32 (SPColorPreview *cp, guint32 rgba)
 141 {
 142         cp->rgba = rgba;
 143
 144         if (GTK_WIDGET_DRAWABLE (cp)) {
 145                 gtk_widget_queue_draw (GTK_WIDGET (cp));
 146         }
 147 }
 148
 149 static void
 150 sp_color_preview_paint (SPColorPreview *cp, GdkRectangle *area)
 151 {
 152         GtkWidget *widget;
 153         GdkRectangle warea, carea;
 154         GdkRectangle wpaint, cpaint;
 155         gint w2;
 156
 157         widget = GTK_WIDGET (cp);
 158
 159         warea.x = widget->allocation.x;
 160         warea.y = widget->allocation.y;
 161         warea.width = widget->allocation.width;
 162         warea.height = widget->allocation.height;
 163
 164         if (!gdk_rectangle_intersect (area, &warea, &wpaint)) return;
 165
 166         /* Transparent area */
 167
 168         w2 = warea.width / 2;
 169
 170         carea.x = warea.x;
 171         carea.y = warea.y;
 172         carea.width = w2;
 173         carea.height = warea.height;
 174
 175         if (gdk_rectangle_intersect (area, &carea, &cpaint)) {
 176                 nr_gdk_draw_rgba32_solid (widget->window, widget->style->black_gc,
 177                                           cpaint.x, cpaint.y,
 178                                           cpaint.width, cpaint.height,
 179                                           cp->rgba);
 180         }
 181
 182         /* Solid area */
 183
 184         carea.x = warea.x + w2;
 185         carea.y = warea.y;
 186         carea.width = warea.width - w2;
 187         carea.height = warea.height;
 188
 189         if (gdk_rectangle_intersect (area, &carea, &cpaint)) {
 190                 nr_gdk_draw_rgba32_solid (widget->window, widget->style->black_gc,
 191                                           cpaint.x, cpaint.y,
 192                                           cpaint.width, cpaint.height,
 193                                           cp->rgba | 0xff);
 194         }
 195 }
 196